simul
Well, I don't really know what you're saying but I know that "convenio" means come together.
Insimul, idipsum.
"Syn-" means "with , together." It is only found in Greek loanwords or words that have Latin and Greek elements mixed together. The native Latin word that means "with, together" is "con- (co-,com-, col, etc)" and gives us English words like "congregation (a flocking together)."
It means "to bring together, enroll together."
Yes, melior una can be taken to mean better together in Latin. The specific meaning of melior una when translated from Latin to English means better than one.
Laurus Partier
I stand together; stand firm.
Lego or Legos
The Latin motto "together we prevail" is una nos increbresco or "united we prevail" is iunctus nos increbresco.
The origion of commotion is Latin. In Latin terms, commotion means "move together."
Socii discitis et socii consequemini